Structural properties of the nanoscopic Al85Ti15 solid solution observed in the hydrogen-cycled NaAlH4 + 0.1TiCl3 system
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Vullum, P.
Sorby, M.
Sulic, M.
Jensen, C.
Walmsley, J.
Holmestad, R.
Hauback, B.
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Abstract
The twice-hydrogen-cycled NaAlH4 + xTiCl3 (x < 0.15) system has been studied by high-resolution X-ray synchrotron diffraction and transmission electron microscopy. Intense low d-spacing shoulders are formed on Al reflections, indicating the formation of a face-centred cubic Al85Ti15 solid solution of unit cell dimension 4.0356 Ů The Al85Ti15 solid solution is found as isolated 4-25 nm nanocrystallites on the NaAlH4 surface. The Al85Ti15 phase is highly 1 1 0{1 1 1} edge dislocated to 6 נ1016 m-2. Local energy-dispersive spectroscopy shows an Al:Ti ratio consistent with an Al85Ti15 composition, confirming an extended solubility of Ti in Al. Structural analysis indicates a quenched L12 superlattice obtained by Al and Ti sublattice swapping, yielding an equivalent A1 model to describe the Al85Ti15 crystal structure.
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Acta Materialia
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56
Issue
17
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Surfaces and Structural Properties of Condensed Matter
Condensed Matter Physics
Materials Engineering
Mechanical Engineering